Pulley block



J. G. BENNETT PULLEY BLOCK Filed June 26, 1928 July 1930.

v 3 Sheets-s l INVENTOR, AME a BEA/"Err A TTORNEYS,

y 1930. J. a. BENNETT A 1,769,411'

' PULLEY BLOCK Filed June 26, 1928 3 Sheets-Sheet 2 INVENTOR. UAMES Gaza/M577 y 1,' 1930. J. G. BENNETT 1,769,411

' PULLEY BLock Filed Jfine 2a, 1928 s Sheets-Sheet s INVENTOR.

ATTORNEY Patented July 1, 1 930 JAMES GQIBENNETT, or SNOQUALMIE, WASHINGTON PULLEY BLOCK l Application filed June 2 6,

over'the sheave may have perfect freedom of travel without any likelihood of frictional 1 cont'actwith the parts between which the sheave is mounted and likewise without any likelihood of displacement from the groove of the sheave to become entangled with such arts.

ally substantial 'in its construction and in which the sheave will be journaled for free andsteady rotation by a bearing construction which is of such nature that the parts thereof may be readily disassembledand replaced, I

side members of the shell separated fromthe as occasion may require.-

Another object of the lnvention is to pro- 7 vide a pulley block-of such'construction that lubricant may be readily suppliedto the antifriction bearing elements and the associated parts, whenever required, withoutany likelihood of splashing of the lubricant and also without any likelihood of its reaching the grooved periphery ofthe sheave or thecable which is passed thereover, and in this connection theinvention 'also'cont'empl'ates so constructing the anti-friction bearing assem blage for the sheave that lubricant may be supplied to the same whilethe sheaveis r0: tatin'g, sothat .the pa-rts may be lubricated i without in anyway interfering with the op erationv of the sheave andcable trained there- I I r I} partofthe bearing "assemblage of the em over. a

40' Another object' of the invention is to so coin -v struct the I block "that lubricant may be ad- 7 mitted to the space between the;op'positesides of the sheave and theimembers' which coni,-,

' prise'thej shellof the'block thus obviating frictional contact between the'surface'of these parts to an eXtentfwhich mighttend to retard the rotationof the sheaveg the construction howeverbeingsuchthat thereis'no likelihood .of any ";lubricant escaping from" thi'ssp'ace and reaching thegrooved periph- Another object of theinvention is to'pro-I I vide a pulley block which will be'exception-a similar to Figure 4 illustrating a slight modi- 1928. Serial No. a s sja'zs.

description which is to follow, constitutea disclosure of the v preferred embodiment of" the invention, it will beunder'stood that-Va rious changes may beinadewithin the scope of What is claimed. v o

Inthe accompanying drawings: e I o Figure 1- is a view inside elevation of one form of pulley block embodying the inven} tion. 7 I a Figure 2 is a-vertical sectional view taken substantially on the line 22of Figure 3. l f

Figure 3 is a viewin front-elevation of the 6 pulley block. 7 f Figure 4 is avertical diametric sectional view taken substantially on the-line -tof Figure l-Jlooking in the direction indicated by the arr ws; 1 l

Figure 5 is a view in eleva'tion of oneof the V remainder of the structure. Figure 6 is a fragmentary sectional view' ficationfof the invention: v lcligure'? isa view si iilar to Figure 6 il lustrating a further modification of the vention. f Figure '8 is a vertical sectional view through a multiple sheave pulley block em bodying the invention. 1 1 i- V V Figure '9 is a vertical diametric sectional viewtaken substantially on the line 9-9 of Figure 8 looking in thedirection indicated by theai'rOWsQ I Figure 10 is avperspective view, indetailgof i a section of a bushing whichconstitutes a bodiment shownin Figure dot the drawings.

7 Figure 11 is aview similar; to Figure-10 illustrating a sectionIof the bushing shown in Fignre7 ofthe'drawing.* a l In the embodiment ofQthe invention shownin- Figures'-1*to,5inclusive, the shell 5 pose which will presently be made apparent,

each of the heads 3 of the shell is formed cent-rally with a circular opening 4. In

order that the pulley block may be suspended or otherwise mounted or sup ported, each head 3 is formed at diametrically opposite points with a thickenedboss 5 provided with spaced ears 6 having alined openings 7, and in the assembled relation of the heads 3 of the shell 1, clevises or shackles may be connected thereto, for the purpose stated.

The shell of the pulley block, embodyingthe invention, further comprises a hub which, in this embodiment: of the invention,

consists of a pair of cylindricalsections 8 the internal diameter of which is the same as the diameter of the openings 4 in the heads 3, the sections 8 of the hub, in this embodiment, being both interiorly and exteriorly V cylindrical. In assembling the sections8 of of the shell, each the hub with the heads '3 section 8 is disposed endwise against the inner face of a respective one of the heads 3, with the bore of the section 8 registering with the opening 4 in the respective head 3, and a packing gasket 9 is interposed between the other end of the said sections and bolts 10 are fitted through openings 11 and 12 formed respectively in the heads 3 and hub sections ,8 and the parts are in this manner secured in assembled relation. 7 In order that lubricant may be supplied to the bearing assemblage which, as will presently be 'described,is arranged aboutthe hub and between the heads 3 of the'shell, the ends of the hubsections 8 whichare relative ly' adjacent to each other, are formed with radial grooves orrec'esses 13 which are preferably equi-distantly spaced, and short tubular spouts 1e are disposed within these recesses and embedded, preferably, injthe packing gasket 9 and project, at their inner ends, slightly inwardly beyond the inner surfaces of the hub sections, the outer ends of the spouts 1 1 being likewise extended ashort'distance beyond the outer surfaces of the said hub sections 8.

J The anti-frict on" bear ng heretofore referred to includes a bushing l which surrounds the hub of the shell and which is indicated in general'by'the nu-v meral 15, and as illustrated in the drawings and more clearlyflin Figures 2 and 4, the

bushing comprises a pair of hollow cylin-, dricalsections 16. which vare preferably of hardened bearing metal and which are interiorly of a diameter toadapt themto be'.

firmly fitted each. onto a respective section 8 of'thehub,v the bushing sections being of the :same length dimensionas the hub sect1on's'8' so that their ends will bein registration. 2 It will beobserved byfreference to] Figure 4 that the outer edge of the packing ring l 9proje c ts between th nner ends of their assemblage 7 the pulley block may travel, and the said sheave 2 is interiorly of a diametersome-c what greater-than the diameter of the hub sections 8 of the shell, and as shown inlFigures 2 and 4- of the drawings a hollow cylinr- 'drical bushing 18 .is arranged within the said sheave 2. Cylindrical roller bearings,

19 are'arranged in an annular series between the bushing 15 comprising the sections 16, V

and the said bushing 18, and it will be ob served that the said bushing 18 is of such dimensions that its ends will register with the opposite side faces of the sheave 2 and that the said sheave is slightly spaced at its opposite outer faces frointhe inner faces of the heads 3 of the shell 1. 7

From the foregoing description of this embodiment of the invention it will be evident that lubricantmay be supplied to the anti-friction bearing rollers 19 and to the surfaces of the bushings 15 and 18, from an ordinary oil can, by way of; any oneeor more of the spouts 14, and in order'that the lubri cant may beretained or confined within the spaces between the inner surfaces of the heads 3 of the shell 1 andthe outer faces of the sheave'2, anj annular groove 20 is formed in the inner face of eachlhead 3 of the shell concentric toandj'spaced inwardly with respect to the periphery of the sheave 2, and a packing.

rin' 21 i's's'eated in each of these moves and bears at its outer side against the opposing face or side of the said sheave as clearly j shown in Figure 4 of the drawings.

In the embodiment just described, the in-. vention contemplates the" employment sof cylindrical roller bearings, but Figure 6 of the drawings illustrates a modification of the invention adapted for the employment of roller bearings of a slightly different contour. Iii-this figure the shell 'is'indicated ingeneral by thenumerali 22 and comprises a pair of heads 23corresponding tothe heads 3 of the previously described embodiment; The hub,

in this embodiment, comprises a} pair of" sections which are interiorlycylindrical l and eXteriorly 'of' frusto-con ical 'icon-' tour, the sections being assembled between the heads 23 in the same manner that cthe sections 80f the hub' are assembled bet-ween'th'e heads 3 of the shelll inthe previously described embodiment, it being observed by reference to Figure 6 that the maj or ends of the sections" 24 are disposed against the inner faces of the respective heads 23 and that a packing washer 25 is interposed between the minor ends of the said hub sections, bolts 26 being fitted through openings in the heads 2.3 of the shell and through the sections of the hub and also through similar openings in the said packing ring 25. i

In this embodiment, the sheave, which is indicated by the numeral 27, does not differ from the sheave of the previously described embodiment except that instead of being interiorly cylindrical, its inner surface is of double-conical form, and in this embodiment the bushing 28 comprising a pair of hollow frusto-conical sections 29 is arranged within the sheave 27 the major ends of the sections 29 being disposed in mutually abutting rela tion as shown in Figure 6. The anti-friction bearing assemblage'further includes a bushing 30 which comprisesIja-pair of hollow frusto-conicalsections 31 which are/disposed to surround the sections 24 of the hub and which abut at their outer endsagainst the inner faces of the heads 23 of the shell 22 and at their inner or relatively adjacent ends engage against opposite sides of the outer periphery of the packingring 25, In-this embodiment of'the invention the anti-friction which is indicated in general by-the numeral 33, comprising a pair ofheads 34'which correspond to the heads 23 and a hub 35 which 7 comprises a pair of sections corresponding to the sect-ions 24. In this embodiment however the hub sect-ions 35 are interiorly cylindrical but exteriorly transversely concave so that the hub sections are approximately of frustoconical form at their exterior surfaces. In

this embodiment, as shown in Figure 7, the

hub sections 35 are assembled with each other and with the heads of the shell 33, in the same manner as arethe hub sections 24 of the em- 'bodiment shown in Figure 6, and the parts i are held in their assembled relation by means of bolts 36. The sheave is indicated'by the numerals 37 and is arranged concentricto the hub and, as shown in Figure 7 a bushing 38 comprising a pair of hollow approximately frusto-conical sections 39 is arranged with:

eachof its sections encompassing a respective one of the hub sections 35, a similar bush ng, indicated in general by the numeral 40, being provided in connection with the sheave 37 and comprising a pair of sections 41 which are of hollow form and of a contour to adapt their outer sides to snugly conform to the contour of the inner periphery of the sheave 37 Anti-friction bearing elements 42 are arranged in an annular series about the hub and between the same and the sheave and these bearing elements are preferably of the ovate form shown in Figure 7, being uniformly curved fromend to end and circumferential- Way between their ends,,the curvature of the surfaces of the bearing elements conforming v substantially to the curvature of the surfaces of the bushing sections betweenwhich they are confined.

ly and of maximum diameter at a point mida The-embodiments ofjthe invention pre-I I viously. described are obviously designedto accommodate a single stretch of cable, "inasmuch as each embodies-but a single sheave,

5 but Figures Sand 9 of the drawings illustrate.

a modification of the invention in which any number of sheaves may be embodied depend-' ing upon the number of cables to be handled.

In these figures the shell is indicated by the numeral 43 and is of substantially the same construction as the shells of the previously Y described forms, and afhub comprising sections' 44 of hollow cylindrical form, isarranged between the heads and apacking Washer 45 is arranged between theinner or relatively adjacent ends: of the hub sections,

bo'lts46 being secured through the hub sections, the heads of the .shell 43, andthe packing washer 45. A; bushing comprising hollow cylindrical sections 47 is arranged to embrace the hub comprising the, sections. 44

and is arranged inthe same manner as the corresponding bushing of the embodiment shown in Figure 4 of the drawings. In'this embodiment three sheaves 48- are mounted withinthe shell for rotation about the hub.

and each sheaveji's provided with a hollow cylindrical bushing49 which fitsj in an opening formed centrally within the sheave, roller bearings 50 being arranged in three annular series between the bushings v47-and 49, g I In order-to prevent longitudinal displace mentof the sheavesfl48 .withrespectto the are seeured at their ends in openings pro- 'videdsintheheads ofthe shell 43 near the outer peripheries H thereof, and combined spacing and guide fingersj52 are mounted at 11-5 I hub of; the, shell of the pulley block, bolts 51- 1 20 their outer ends upon-the'bolts 51 and project radially inwardly and. each between a pair of thesheaves 48, spacing sleeves 53 being mounted upon the bolts 51 between the said ends of the fingers 52 so as to maintainthe members 52 in proper position to extend be tween the sheaves 48 and maintain the sheaves against'displacement, In this em-} bodiment of the invention, oil spouts '54 are provided and correspond to the spouts 14 of the'first describedembodiment, and likewise, in order to prevent the escape of lubricant be tween the heads of the shell and the faces of the sheaves, packing rings are arranged in annular grooves in the ,inner faces of the heads of the shell and are in contactwith the adjacent sides or faces of the endmost ones of'the series of sheaves.

Having thus described the invention, what I claim is:

l. A pulley block comprising a pair of spaced frame plates having enlarged central openings, a hollow hub including a pair of annular sections placed end to end between the frame plates and having the'ir'outer ends 7 abutt1ng=the inner faces of the frame plates.

and surrounding the openings therein, the bore of the hollow hub registering with the openings'in the frame plates, a sheave between the plates and concentrically surrounding the hub, anti-friction bearing elements arranged in an annular serles between. the hub and sheave, an annular washer disposed between the adjacent ends of the hub sections, oil filling spouts imbedded in the washer and extending into the bore of the hub whereby the same will be accessible from within the hub for conducting lubricant to the space between the hub and said sheave, and fastening members extending through the frame plates, hub sections, and washer.

2. A pulley block comprising a pair of spaced frame plates having enlarged'central openings, a hollow hub including a pair of annular sections placed end to end between the frame plates and having the outer ends.

abutting the inner faces of the frame plates and surrounding the openings therein, the.

bore of the hollow hub registering with the openings'in' the frame plates, a plurality of sheaves between theplates and concentrically'surrounding the hub, anti-friction bearing elements arranged in an annular series between the hub and sheaves, fastening mema bers extending through theframe plates and i the hub sections, fastening members connecting the frame plates together and extending beyond the peripheries of the sheaves, and

inwardly directed guide and spacer arms carried by said last mentioned fastening elements and extending between said sheaves.

' In testimony whereof I ailix my signature. i JAMES G; BENNETT. 

